Vibecoding Pro

Transform your AI coding workflow from "write and hope" to "iterate with precision." VibeCoding Pro implements the Generator-Evaluator dual-agent pattern (inspired by Anthropic's engineering research and GAN design theory) — separating the creative agent that produces code from an independent QA agent that validates it through real browser interaction. Eliminates AI self-evaluation bias structurally, not through better prompts. Use when: building React/UI components that need real quality assurance, running multi-round AI-assisted development sprints, or upgrading from "vibe coding" (prompt → code → done) to genuine engineering-grade AI development workflows.

The AI coding upgrade that actually ships working software.

VibeCoding is fun. VibeCoding Pro is reliable.

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What VibeCoding Gets Wrong

Most AI coding workflows look like this:

text

You → "build a login form" → AI generates → "looks good!" → ship it
                                            ↑
                                   This is the problem.

Why it's broken: The same AI that generated the code judges whether it works. It suffers from cognitive commitment bias — it can't objectively evaluate what it just built because it already committed to the approach. Bugs survive. Edge cases break. UX issues ship.

The evidence: Anthropic's 2026 engineering research ran an experiment. Solo Claude agents produced 2D game makers where the core game loop was fundamentally broken — entities rendered but ignored all player input. The agent called its own output "working." Only when a separate Evaluator agent physically clicked through the game did it discover the wiring between entity definitions and game runtime was severed.

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What VibeCoding Pro Gets Right

text

User Goal / Spec
      ↓
 ┌─────────────┐
 │  Generator  │ ← "Build X according to spec"
 │  (vibe)     │
 └──────┬──────┘
        │ artifact
        ↓
 ┌────────────────────────────────────┐
 │           Evaluator                │
 │  • Reads SPEC (NOT generator output)│
 │  • Opens URL in real browser        │
 │  • Clicks, fills, navigates         │
 │  • Scores on rubric (0-100)          │
 │  • Returns structured JSON feedback  │
 └────────────────┬───────────────────┘
                  │ score + feedback
                  ↓
         ┌────────────────┐
         │ score ≥ threshold? │
         │ YES → Done     │
         │ NO → Generator  │
         └────────┬────────┘
                  └── Loop (5-15 rounds)

The structural fix: Evaluator never reads the generator's code, reasoning, or commit messages. It only reads the SPEC and operates the deployed artifact. This eliminates anchoring bias architecturally — not through clever prompting.

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When to Use VibeCoding Pro

Scenario	Apply?	Why
React / H5 / Web UI with real interactions	✅ Yes	Playwright can actually click through it
Multi-step form flows (wizard, checkout, onboarding)	✅ Yes	Evaluator can exercise each step
API + frontend integration	✅ Yes	Evaluator calls endpoints and checks DB state
Single utility function	⚠️ Optional	Might be overkill
Pure backend logic (no UI)	⚠️ Use API Evaluator template	Evaluator calls endpoints directly
Design-sensitive work (brand identity, layout)	✅ Yes	Human-in-the-loop variant works best

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Quick Start

Step 1: Write a Spec Contract

The SPEC is the most important artifact. It's the Evaluator's only reference.

markdown

# Spec: [Feature Name] v1.0

## Goal
[One sentence: what exists when this is done?]

## Functional Requirements
- FR-001: [Specific, testable, observable]
- FR-002: [...]

## Interaction Specifications
- UI-001: [User clicks X → Y happens]
- UI-002: [Form accepts type Y, rejects type N]

## Acceptance Criteria
- AC-001: [Measurable outcome]
- AC-002: [...]

## Out of Scope
- [Explicitly NOT required]

## Test Scenarios
**Scenario 1:** Happy path — normal user completes primary action
**Scenario 2:** Edge case — empty data, error state
**Scenario 3:** Boundary — max input length, concurrent actions

Step 2: Run the Loop

1. Generator Agent receives: SPEC + iteration history + previous Evaluator feedback
2. Generator builds artifact and deploys
3. Evaluator Agent receives: SPEC + deployed URL (NOT generator code)
4. Evaluator opens browser, clicks through test scenarios, screenshots, scores
5. Evaluator returns structured JSON with score breakdown
6. If score ≥ threshold → done. If not → loop back to Generator.

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Architecture Reference

See references/architecture.md for:

• Four architecture variants (Sequential / Parallel / Staged / Human-in-loop)
• GAN theory deep-dive and why it works
• Spec Contract template (copy-paste ready)
• History format and loop control logic
• Anti-patterns and how to fix them

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Evaluator Templates

See references/evaluator-prompts.md for:

Template	When to Use	Evaluator Mode
Web/H5 UI	React/Vue/H5/Web components	Playwright browser automation
API/Backend	REST endpoints, microservices	Direct HTTP calls
Content/Docs	Reports, copy, documentation	Structured text scoring

Each template includes:

• System prompt (calibrated for evaluator independence)
• User prompt with rubric
• Required JSON output schema
• 4 calibration examples (30/60/85/95 score ranges)

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Iteration Loop Scripts

See scripts/iteration_loop.py for a complete Python implementation:

• run_generator() — adapt to your agent (Claude API, OpenAI, subagent, etc.)
• run_evaluator() — adapt to your QA stack (Playwright, HTTP client, etc.)
• Full loop control: plateau detection, approach switching, escalation
• CLI: python iteration_loop.py --spec spec.md --url http://localhost:3000 --threshold 85 --rounds 15

See scripts/calibrate_evaluator.py for evaluator calibration utility:

• Run on 4 known examples before production
• Auto-detects score drift and suggests rubric adjustments

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Scoring Rubric

Default rubric (adjust weights by domain):

Dimension	Weight	Measures
Functional completeness	30%	Every spec requirement works end-to-end
Interaction quality	25%	Click/form/nav behavior as a real user
Edge case handling	20%	Error states, empty data, boundary inputs
Code/design quality	15%	Consistency, readability, no anti-patterns
Originality/craft	10%	Avoids template defaults and AI slop patterns

Threshold guidelines:

Use Case	PASS_THRESHOLD	MAX_ROUNDS
Internal prototype	70	10
User-facing feature	85	15
Production critical	95	20 + human review

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Why This Works (Research Background)

Source: Anthropic Engineering, "Harness Design for Long-Running Application Development" (March 2026)

Key findings:

• Solo Claude agents on 16-feature game maker: core game loop broken, entity runtime wiring severed
• Full harness (Generator + Evaluator): fully working, sprite animation, sound, AI-assisted level design
• Opus 4.6 vs 4.5: improved planning reduced harness complexity needed
• Evaluator value is situational: worth the cost when task exceeds what the model reliably does solo

GAN theory parallel: The Generator tries to fool the Evaluator. The Evaluator tries to catch failures the Generator misses. The adversarial tension drives quality upward. Unlike ML GANs, this uses natural language feedback — it's fully inspectable and steerable.

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Common Mistakes

Mistake	Why It Fails	Fix
Same agent generates and evaluates	Cognitive anchoring bias	Separate agents with separate prompts
Evaluator reads generator's code	Judges intent, not reality	Show only deployed URL
Skipping calibration	Score inflation/drift	Run 3-5 known examples first
Vague scoring ("7/10 looks fine")	Unactionable feedback	Require structured JSON per rubric
Too few rounds	Generator never converges	Minimum 10 rounds for complex UI
Never switching approach	Gets stuck in local minimum	Switch strategy after 3 plateauing rounds
Using for trivial tasks	Overhead > value	Reserve for multi-feature/full-page work

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OpenClaw Integration

In OpenClaw, use the coder + tester subagents:

text

Generator → sessions_spawn(agentId="coder", ...)
Evaluator → sessions_spawn(agentId="tester", ...) + browser tool

The tester subagent should use the Playwright MCP tool:

• browser_navigate → open URL
• browser_click → interact
• browser_fill → form input
• browser_screenshot → capture evidence

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Built on Anthropic's 2026 engineering research. Inspired by GAN theory and adversarial validation patterns.